Ck 12: Life Science: Theory of Evolution by Natural Selection

[Free Registration/Login may be required to access all resource tools.] Do you ever wonder why some birds are big like ostriches and some birds are small like robins? Or why a lion has a mane while a leopard has spots? In the 19th century, an English natural scientist named Charles Darwin was also fascinated by the diversity of life on Earth. Learn more about the theory of evolution by natural selection in this learning module produced by CK-12.